https://projecteuler.net https://projecteuler.net It is not a course but a collection of tasks and problems. https://cryptopals.com/ https://cryptopals.com/

https://projecteuler.net https://projecteuler.net It is not a course but a collection of tasks and problems. https://cryptopals.com/ https://cryptopals.com/ Basically the same approach but with a strong focus on implementing cryptography and learning something about cryptology in the process.